/*
 * Copyright 2010-2011 CGT&DC ISA RAS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package websolve.workflow.runtime.script;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

import websolve.workflow.runtime.Task;
import websolve.workflow.runtime.TaskState;
import websolve.workflow.runtime.util.MiscUtils;

public class ScriptTask extends Task {

    private String script;
    private ScriptEngine engine;

    public ScriptTask(String name, String engine, String script, String[] inputs, String[] outputs) {
        super(name);

        this.script = script;
        System.out.println("Script: " + script);

        for (String input : inputs) {
            addInput(input);
            System.out.println("Input: " + input);
        }
        for (String output : outputs) {
            addOutput(output);
            System.out.println("Output: " + output);
        }

        this.engine = new ScriptEngineManager().getEngineByName(engine);
    }

    @Override
    public void run() {
        setState(TaskState.RUNNING);
        try {

            for (String param : getInputs().keySet()) {
                Object value = getInputValue(param);
                engine.put(param, value);
            }

            engine.eval(script);

            for (String param : getOutputs().keySet()) {
                Object value = engine.get(param);
                if (value != null) {
                    setOutputValue(param, value);
                } else {
                    getOutput(param).setCancelled(true);
                }
            }

            setState(TaskState.DONE);
        } catch (Exception e) {
            e.printStackTrace();
            setError(MiscUtils.stackTraceToString(e));
            setState(TaskState.FAILED);
        }
    }

}
